Shortcut keys with numbers don't work in combination with the numpad

I want to use the shortcut keys Next Tab (Ctrl-1) and Previous Tab (Ctrl+2). Unfortunately nothing happened when using Ctrl-1/2 on the numpad. If I use Ctrl-1/2 on the normal keyboard I get the next/previous tab. Normally I'm lefthand mouse, righthand numblock user. Any suggestions for a solution, or I have to wait for the next Vivaldi version(s)? Windows 7 Pro . Vivaldi 1.0.190.2